China has gradually grown and developed in the field of ultra-fine grained carbide tools.

Ultrafine cemented carbide is also commonly referred to as ultrafine grained cemented carbide, which refers to a cemented carbide material having a WC grain size of less than 0.5 μm. The smaller the grain size of WC, the higher the density, the higher the hardness and the higher the strength of the corresponding cemented carbide materials, and the comprehensive performance has been greatly improved. In some foreign ultra-fine grained carbide products, the hardness of the 0.2μm grain size cemented carbide material is greater than 93.5HRA, and the strength is greater than 4000MPa. In addition, the ultra-fine grained carbide PCB micro-drills commonly used in the field of microelectronics can be up to 10μm in diameter and micro-milling diameters up to 30μm. Domestic research on ultra-fine cemented carbide started late, but it has gradually grown in the field of ultra-fine-grain cemented carbide tools. It has a wide range of fields in aerospace, nuclear power, power generation equipment, electronic communication and other modern energy manufacturing industries. Application prospects. It has broken the embarrassing situation that has been monopolized by foreign companies and foreign-funded enterprises. In particular, these high-efficiency tools have excellent performance in the processing of aluminum alloys, titanium alloys, nickel alloys and carbon fiber composite materials such as airplanes, satellites and power equipment. The performance is close to or even surpassing the advanced level of foreign countries, and has gradually replaced imports, and now it has occupied nearly 20% of the market.
In order to avoid the phenomenon of “chemical vapor phase migration”, carbon reduction is often used in the production of ultrafine tungsten powder in various countries. For example, the WO3 direct reduction/carbonization method used in Japan for the preparation of ultrafine WC powder, and the continuous direct carbonization process in the United States. And a composite powder method, a sol-gel method, and the like. The most effective method currently adopted in China is to prepare ultrafine W powder and WC powder by nano-needle purple tungsten in situ reduction method. The principle is: using the large specific surface area and sharp instability of the nano-needle purple tungsten, under the action of high temperature hydrogen, the in-situ rapid reduction produces a bead-like ultra-fine tungsten single crystal. This method suppresses the growth of ultrafine tungsten powder grains by weakening or suppressing "chemical vapor phase migration". In addition, it also avoids the shortcomings of the phase impurity of the product in the direct reduction/carbonization ultrafine tungsten powder process of WO3.